Sen. Josh Hawley (R-MO) asked this week for the GOP floor leader, Sen. Mitch McConnell of Kentucky, to step down from his top post amid health concerns.
Pharmaceutical giant says its vaccine only "may be" effective in reducing "severe disease and hospitalization," and falls short of confirming protection from infection.
The 81-year-old Republican leader was in the midst of a press interaction when a journalist inquired about his intention to run for reelection in 2026.